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目的 通过对腰椎间盘CT平扫与CT脊髓造影 (CTM)的影像表现对照观察 ,提出“盘黄间隙”的概念 ,分析其狭窄的原因及其对腰神经根压迫的诊断意义。方法 回顾性分析 83例腰椎间盘CT平扫与CTM的影像资料 ,分别记录L3～S1腰间盘形态 ,双侧黄韧带厚度 ;双侧上关节突内突程度及相应硬膜囊前后径。分析这些结构及数据与盘黄间隙狭窄及其对腰神经根压迫的关系。结果138个间盘突出或膨出 ,相应硬膜囊前后径 <10mm ,5 3处黄韧带厚度 >5mm ;6 7侧上关节突增生内突 ,且超过 2mm。盘黄间隙为腰间盘平面位于椎管外侧份间盘与黄韧带之间的间隙。 15 7侧显示腰神经根或根鞘受压 ,相应盘黄间隙平均宽度为 3 8mm。结论 盘黄间隙≤ 5mm即为狭窄。其主要原因有 :间盘突出或膨出 ,尤其是旁中央型侧向突出 ,黄韧带肥厚 ;小关节突增生内突等。它可以作为腰椎间盘CT检查诊断腰神经根压迫较可靠的依据
OBJECTIVE: To observe the imaging manifestations of lumbar disc CT and CT myelography (CTM) and to put forward the concept of “disc yellow space” and to analyze its causes of stenosis and its diagnostic significance on lumbar nerve root compression. Methods The images of 83 cases of lumbar intervertebral disc CT and CT were retrospectively analyzed. The shapes of L3 ~ S1 disc and the thickness of bilateral ligamentum flavum were recorded respectively. The degree of bilateral procession and the anteroposterior diameter of the dural sac were recorded. The relationship between these structures and data with the yellow disc space stenosis and compression of the lumbar nerve root was analyzed. The results of 138 intervertebral disc herniation or bulging, the corresponding dural sac anteroposterior diameter <10mm, 5 3 ligamentum flavum thickness> 5mm; 67 on the side of the sudden protrusion of the process of protrusion, and more than 2mm. Disk space for the disc yellow disc surface is located in the lateral intervertebral disc and yellow ligament between the gap. 15 7 side showed lumbar nerve root or root sheath compression, the corresponding disk yellow gap average width of 3 8mm. Conclusion disc yellow gap ≤ 5mm is narrow. The main reasons are: disc protrusion or bulging, especially in the lateral side of the central prominent yellow ligament hypertrophy; facet joint protrusion and so on. It can be used as lumbar disc CT diagnosis of lumbar nerve root compression more reliable basis